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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Comprehensive Income [Abstract]      
Net Earnings $ 448,636 $ 420,536 $ 357,929
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments (net of tax of $0 in 2013, 2012, and 2011) (7,354) 3,522 (3,791)
Change in marketable securities (net of tax of $0 in 2013, 2012, and 2011) 98 39 95
Comprehensive income $ 441,380 $ 424,097 $ 354,233